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Optimizing Associative Memory In Autistic And Non-Autistic Adults: Retrieval Practice, Post-Retrieval Feedback, And Gesture, Brianna E. Cairney Jul 2024

Optimizing Associative Memory In Autistic And Non-Autistic Adults: Retrieval Practice, Post-Retrieval Feedback, And Gesture, Brianna E. Cairney

LSU Doctoral Dissertations

Associative memory—or the ability to form a memory representation linking two previously unrelated concepts—is a critical aspect of learning. This work provides insight into strategies that can be used to support associative memory, their underlying mechanisms, and their effectiveness in autistic and non-autistic learners. Chapter 1 demonstrates that iconic gestures can be used as a tool to enhance associative memory by increasing word concreteness and imageability. This effect was eliminated when the iconic gestures were interspersed with ambiguous nonsense gestures, suggesting a boundary on these benefits that depends on listener expectations regarding gesture clarity. However, it remains unknown whether gestures …

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Holomorphic Functional Calculus Approach To The Characteristic Function Of Quantum Observables, Andreas Boukas Jul 2024

Holomorphic Functional Calculus Approach To The Characteristic Function Of Quantum Observables, Andreas Boukas

Journal of Stochastic Analysis

No abstract provided.

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Quantifying Compound And Nonlinear Effects Of Hurricane-Induced Flooding Using A Dynamically Coupled Hydrological-Ocean Model, Daoyang Bao, Z. George Xue, John C. Warner Jul 2024

Quantifying Compound And Nonlinear Effects Of Hurricane-Induced Flooding Using A Dynamically Coupled Hydrological-Ocean Model, Daoyang Bao, Z. George Xue, John C. Warner

Faculty Publications

We recently developed a dynamically coupled hydrological-ocean modeling system that provides seamless coverage across the land-ocean continuum during hurricane-induced compound flooding. This study introduced a local inertial equation and a diagonal flow algorithm to the overland routing of the coupled system’s hydrology model (WRF-Hydro). Using Hurricane Florence (2018) as a test case, the performance of the coupled model was significantly improved, evidenced by its enhanced capability of capturing backwater and increased water level simulation accuracy and stability. With four model experiments, we present a framework to detangle, define, and quantify compound and nonlinear effects. The results revealed that the flood …

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A Roadmap To The Next-Generation Technology-Enabled Learning-Centered Environments In Aec Education, Yimin Zhu, Amirhosein Jafari, Amir H. Behzadan, Raja R.A. Issa Jul 2024

A Roadmap To The Next-Generation Technology-Enabled Learning-Centered Environments In Aec Education, Yimin Zhu, Amirhosein Jafari, Amir H. Behzadan, Raja R.A. Issa

Faculty Publications

The architecture, engineering, and construction (AEC) education communities are increasingly facing challenges caused by social, technological, economic, environmental, and political changes. Addressing these issues requires AEC educators and practitioners to systematically rethink and reform many of their current practices. Anecdotal evidence in AEC education already exists with respect to pedagogical improvements made by individual technologies such as immersive computing, artificial intelligence, robotics, big data, cyberinfrastructure, and photogrammetry. However, an effective learning-centered environment is more complex than what any single technology can accomplish. In addition, the relationship between technology-intensive learning and digital inequity in AEC education remains, to the most extent, …

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A Compressive Load Bearing Analysis Of 3d-Printed Circular Elements, Ilerioluwa Giwa, Ali Kazemian, Vijaya Gopu, Tyson Rupnow Jul 2024

A Compressive Load Bearing Analysis Of 3d-Printed Circular Elements, Ilerioluwa Giwa, Ali Kazemian, Vijaya Gopu, Tyson Rupnow

Faculty Publications

Large-scale construction 3D printing is a promising platform technology that can be leveraged to fabricate structural elements such as columns, piers, pipes, and culverts. In this study, the axial compression and split tensile performance of 3D-printed steel-fiber-reinforced circular elements fabricated with different configurations (hollow, hybrid, mold-cast, and fully 3D-printed) is evaluated. This study further investigates the performance of multi-material circular hybrid elements (3D-printed shells with different backfilled core materials) in an attempt to assess their suitability as a new construction paradigm. The experimental results revealed that the fully 3D-printed steel-fiber-reinforced circular elements exhibited a higher load capacity (up to 36%) …

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Hd-Tdcs Over Left Supplementary Motor Area Differentially Modulated Neural Correlates Of Motor Planning For Speech Vs. Limb Movement, Fatemeh Tabari, Celeste Patron, Hope Cryer, Karim Johari Jul 2024

Hd-Tdcs Over Left Supplementary Motor Area Differentially Modulated Neural Correlates Of Motor Planning For Speech Vs. Limb Movement, Fatemeh Tabari, Celeste Patron, Hope Cryer, Karim Johari

Faculty Publications

The supplementary motor area (SMA) is implicated in planning, execution, and control of speech production and limb movement. The SMA is among putative generators of pre-movement EEG activity which is thought to be neural markers of motor planning. In neurological conditions such as Parkinson's disease, abnormal pre-movement neural activity within the SMA has been reported during speech production and limb movement. Therefore, this region can be a potential target for non-invasive brain stimulation for both speech and limb movement. The present study took an initial step in examining the application of high-definition transcranial direct current stimulation (HD-tDCS) over the left …

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Application Of Near-Infrared Spectroscopy For Hay Evaluation At Different Degrees Of Sample Preparation, Eun Chan Jeong, Kun Jun Han, Farhad Ahmadi, Yan Fen Li, Li Li Wang, Young Sang Yu, Jong Geun Kim Jul 2024

Application Of Near-Infrared Spectroscopy For Hay Evaluation At Different Degrees Of Sample Preparation, Eun Chan Jeong, Kun Jun Han, Farhad Ahmadi, Yan Fen Li, Li Li Wang, Young Sang Yu, Jong Geun Kim

Faculty Publications

Objective: A study was conducted to quantify the performance differences of the near-infrared spectroscopy (NIRS) calibration models developed with different degrees of hay sample preparations. Methods: A total of 227 imported alfalfa (Medicago sativa L.) and another 360 imported timothy (Phleum pratense L.) hay samples were used to develop calibration models for nutrient value parameters such as moisture, neutral detergent fiber, acid detergent fiber, crude protein, and in vitro dry matter digestibility. Spectral data of hay samples prepared by milling into 1-mm particle size or unground were separately regressed against the wet chemistry results of the abovementioned parameters. Results: The …

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Effects Of The Menstrual Cycle And Hormonal Contraceptive Use On Metabolic Outcomes, Strength Performance, And Recovery: A Narrative Review, Hannah E. Cabre, Lacey M. Gould, Leanne M. Redman, Abbie E. Smith-Ryan Jul 2024

Effects Of The Menstrual Cycle And Hormonal Contraceptive Use On Metabolic Outcomes, Strength Performance, And Recovery: A Narrative Review, Hannah E. Cabre, Lacey M. Gould, Leanne M. Redman, Abbie E. Smith-Ryan

Clinical Research Faculty Publications

The effects of female sex hormones on optimal performance have been increasingly recognized as an important consideration in exercise and sport science research. This narrative review explores the findings of studies evaluating the effects of menstrual cycle phase in eumenorrheic women and the use of hormonal contraception (oral contraceptives and hormonal intrauterine devices) on metabolism, muscular strength, and recovery in active females. Ovarian hormones are known to influence metabolism because estrogen is a master regulator of bioenergetics. Importantly, the menstrual cycle may impact protein synthesis, impacting skeletal muscle quality and strength. Studies investigating muscular strength in eumenorrheic women report equivocal …

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Wood Ducks And Hooded Mergansers As Interspecific Brood Parasites: An Evaluation Of Parasitic Egg Survival, Dylan L. Bakner, Kevin M. Ringelman, Larry A. Reynolds, Richard M. Kaminski, Scott E. Stephens, J. Brian Davis Jul 2024

Wood Ducks And Hooded Mergansers As Interspecific Brood Parasites: An Evaluation Of Parasitic Egg Survival, Dylan L. Bakner, Kevin M. Ringelman, Larry A. Reynolds, Richard M. Kaminski, Scott E. Stephens, J. Brian Davis

Faculty Publications

Conspecific and interspecific brood parasitism are alternate reproductive strategies more pervasive in waterfowl than in any other group of birds. While previous research has measured costs incurred by nest hosts incubating parasitized clutches, few studies have focused on the relative success of parasites. Here, we evaluated the success of wood duck (Aix sponsa) and hooded merganser (Lophodytes cucullatus) eggs laid parasitically in Louisiana and Mississippi. We monitored nest boxes, assigned eggs in each nest as host or parasitic, and determined the number of eggs that hatched and failed. Across all study areas (1994–1999 and 2020–2023), we monitored 1750 wood duck …

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Toward Concurrent Identification Of Human Activities With A Single Unifying Neural Network Classification: First Step, Andrew Smith, Musa Azeem, Chrisogonas O. Odhiambo, Pamela J. Wright, Hanim E. Diktas, Spencer Upton, Corby K. Martin, Brett Froeliger, Cynthia F. Corbett, Homayoun Valafar Jul 2024

Toward Concurrent Identification Of Human Activities With A Single Unifying Neural Network Classification: First Step, Andrew Smith, Musa Azeem, Chrisogonas O. Odhiambo, Pamela J. Wright, Hanim E. Diktas, Spencer Upton, Corby K. Martin, Brett Froeliger, Cynthia F. Corbett, Homayoun Valafar

Clinical Research Faculty Publications

The characterization of human behavior in real-world contexts is critical for developing a comprehensive model of human health. Recent technological advancements have enabled wearables and sensors to passively and unobtrusively record and presumably quantify human behavior. Better understanding human activities in unobtrusive and passive ways is an indispensable tool in understanding the relationship between behavioral determinants of health and diseases. Adult individuals (N = 60) emulated the behaviors of smoking, exercising, eating, and medication (pill) taking in a laboratory setting while equipped with smartwatches that captured accelerometer data. The collected data underwent expert annotation and was used to train a …

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Isocaloric Replacement Of Ultraprocessed Foods Was Associated With Greater Weight Loss In The Pounds Lost Trial, Qisi Yao, Carolina D. De Araujo, Filippa Juul, Catherine M. Champagne, George A. Bray, Frank M. Sacks, Maya K. Vadiveloo Jul 2024

Isocaloric Replacement Of Ultraprocessed Foods Was Associated With Greater Weight Loss In The Pounds Lost Trial, Qisi Yao, Carolina D. De Araujo, Filippa Juul, Catherine M. Champagne, George A. Bray, Frank M. Sacks, Maya K. Vadiveloo

Population and Public Health Science Faculty Publications

Objective: Higher intake of ultraprocessed foods (UPFs) is associated with obesity. We examined whether replacing UPFs (NOVA 4) with minimally processed foods and culinary ingredients (NOVA 1 + 2) was associated with differential weight change in this secondary prospective analysis of the Preventing Overweight Using Novel Dietary Strategies (POUNDS) Lost trial. Methods: We estimated percent energy intake (%kcal) from the four NOVA groups using 24-h dietary recalls in a subset of 356 participants. Multivariable-adjusted substitution models examined whether replacing %kcal from UPFs with NOVA 1 + 2 was associated with greater weight, body fat percentage, trunk fat, and waist circumference …

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Sleep And Fundamental Movement Skills In Primary Schoolchildren: The React Project, Jean Philippe Chaput, Sara Pereira, Peter T. Katzmarzyk, Donald Hedeker, Tiago V. Barreira, Rui Garganta, Cláudio Farias, Fernando Garbeloto, Go Tani, David F. Stodden, José Maia Jul 2024

Sleep And Fundamental Movement Skills In Primary Schoolchildren: The React Project, Jean Philippe Chaput, Sara Pereira, Peter T. Katzmarzyk, Donald Hedeker, Tiago V. Barreira, Rui Garganta, Cláudio Farias, Fernando Garbeloto, Go Tani, David F. Stodden, José Maia

Population and Public Health Science Faculty Publications

Objective: Whether sleep is related to fundamental movement skills (FMS) in the pediatric population is largely unknown. The objective of this study was to examine the association between sleep characteristics (duration, efficiency, regularity) and FMS proficiency levels in school-aged children. Methods: This cross-sectional study included 996 children (mean age: 8.3 ± 1.2 years) from 25 of the 32 primary schools in Matosinhos, northern Portugal. Data collection occurred between January and June 2022. Sleep was assessed using an ActiGraph wGT3X-BT accelerometer worn on the wrist for 7 consecutive days. FMS proficiency levels were assessed in the schools with a new digital …

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Background, Rationale, And Methodological Overview Of The React Project—Return-To-Action On Growth, Motor Development, And Health After The Covid-19 Pandemic In Primary School Children, Sara Pereira, Peter T. Katzmarzyk, Donald Hedeker, Tiago V. Barreira, Rui Garganta, Cláudio Farias, Fernando Garbeloto, Go Tani, Jean Philippe Chaput, David F. Stodden, José Maia Jul 2024

Background, Rationale, And Methodological Overview Of The React Project—Return-To-Action On Growth, Motor Development, And Health After The Covid-19 Pandemic In Primary School Children, Sara Pereira, Peter T. Katzmarzyk, Donald Hedeker, Tiago V. Barreira, Rui Garganta, Cláudio Farias, Fernando Garbeloto, Go Tani, Jean Philippe Chaput, David F. Stodden, José Maia

Population and Public Health Science Faculty Publications

Objectives: The REACT project was designed around two main aims: (1) to assess children's growth and motor development after the COVID-19 pandemic and (2) to follow their fundamental movement skills' developmental trajectories over 18 months using a novel technological device (Meu Educativo®) in their physical education classes. In this introductory article, the first of the Journal's special issue dedicated to REACT, our goal was to present the project rationale, its methodology, training and certification of the team, statistical approach, quality control, governance, and study management. Methods: We sampled 1000 children (6–10 years of age) from 25 of the 32 primary …

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A Multivariate Multilevel Approach To Unravel The Associations Between Individual And School Factors On Children's Motor Performance In The React Project, José Maia, Carla Santos, Sara Pereira, Donald Hedeker, Tiago V. Barreira, Rui Garganta, Cláudio Farias, Fernando Garbeloto, Go Tani, Hugo Cruz, Jean Philippe Chaput, David F. Stodden, Peter T. Katzmarzyk Jul 2024

A Multivariate Multilevel Approach To Unravel The Associations Between Individual And School Factors On Children's Motor Performance In The React Project, José Maia, Carla Santos, Sara Pereira, Donald Hedeker, Tiago V. Barreira, Rui Garganta, Cláudio Farias, Fernando Garbeloto, Go Tani, Hugo Cruz, Jean Philippe Chaput, David F. Stodden, Peter T. Katzmarzyk

Population and Public Health Science Faculty Publications

Objective: The aim was to (1) estimate the relationship between physical fitness (PF) and object control fundamental movement skills (FMS), (2) identify child characteristics that relate with PF and FMS, and (3) examine associations between the school environment, PF, and FMS. Methods: The sample included 1014 Portuguese children aged 6–10 years from the REACT project. PF was assessed via running speed, shuttle run, standing long jump, handgrip, and the PACER test. Object control FMS were assessed with stationary dribble, kick, catch, overhand throw, and underhand roll. Test performances were transformed into z-scores, and their sum was expressed as overall PF …

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Associations Of Obesity, Movement Behaviors, And Socioeconomic Status With Fundamental Movement Skills In Children: Results From The React Project, Priscyla Praxedes, José Maia, Carla Santos, Fernando Garbeloto, Donald Hedeker, Tiago V. Barreira, Rui Garganta, Cláudio Farias, Go Tani, Jean Philippe Chaput, David F. Stodden, Peter T. Katzmarzyk, Sara Pereira Jul 2024

Associations Of Obesity, Movement Behaviors, And Socioeconomic Status With Fundamental Movement Skills In Children: Results From The React Project, Priscyla Praxedes, José Maia, Carla Santos, Fernando Garbeloto, Donald Hedeker, Tiago V. Barreira, Rui Garganta, Cláudio Farias, Go Tani, Jean Philippe Chaput, David F. Stodden, Peter T. Katzmarzyk, Sara Pereira

Population and Public Health Science Faculty Publications

Objective: To investigate the relationship of biological characteristics (age, sex, and obesity), movement behaviors (physical activity and sedentary time), and family socioeconomic status with fundamental movement skills (FMS) in primary school children. Methods: This cross-sectional study sampled 1014 children (537 girls) aged 6 to 10 years from 25 primary schools in Matosinhos, north of Portugal. Five object control skills (dribbling, kicking, catching, throwing, and underarm rolling) were assessed with a categorical scale using the Meu Educativo® platform. Body Mass Index (BMI) was calculated and transformed into z-scores. Moderate-to-vigorous physical activity (MVPA) and sedentary time were monitored with accelerometry (ActiGraph wGT3X-BT) …

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Statistical Analysis Of The Longitudinal Fundamental Movement Skills Data In The React Project Using The Multilevel Ordinal Logistic Model, Donald Hedeker, Sara Pereira, Fernando Garbeloto, Tiago V. Barreira, Rui Garganta, Cláudio Farias, Go Tani, Jean Philippe Chaput, David F. Stodden, José Maia, Peter T. Katzmarzyk Jul 2024

Statistical Analysis Of The Longitudinal Fundamental Movement Skills Data In The React Project Using The Multilevel Ordinal Logistic Model, Donald Hedeker, Sara Pereira, Fernando Garbeloto, Tiago V. Barreira, Rui Garganta, Cláudio Farias, Go Tani, Jean Philippe Chaput, David F. Stodden, José Maia, Peter T. Katzmarzyk

Population and Public Health Science Faculty Publications

Objectives: The REACT project was designed around two main aims: (1) to assess children's growth and motor development after the COVID-19 pandemic and (2) to follow their fundamental movement skills' developmental trajectories over 18 months using a novel technological device (Meu Educativo®) in their physical education classes. In this article, our goal is to describe statistical analysis of the longitudinal ordinal motor development data that was obtained from these children using the multilevel ordinal logistic model. Methods: Longitudinal ordinal data are often collected in studies on motor development. For example, children or adolescents might be rated as having poor, good, …

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Is There An Association Between Proficiency In Fundamental Movement Skills And Mderate-To-Vigorous Physical Activity In Childhood On Weekdays And Weekends? The React Project, Fernando Garbeloto, José Maia, Tiago V. Barreira, Donald Hedeker, Jean Philippe Chaput, Rui Garganta, Cláudio Farias, Ricardo Santos, David F. Stodden, Go Tani, Peter T. Katzmarzyk, Sara Pereira Jul 2024

Is There An Association Between Proficiency In Fundamental Movement Skills And Mderate-To-Vigorous Physical Activity In Childhood On Weekdays And Weekends? The React Project, Fernando Garbeloto, José Maia, Tiago V. Barreira, Donald Hedeker, Jean Philippe Chaput, Rui Garganta, Cláudio Farias, Ricardo Santos, David F. Stodden, Go Tani, Peter T. Katzmarzyk, Sara Pereira

Population and Public Health Science Faculty Publications

Objective: The present study probes into the association between children's fundamental movement skills (FMS) and moderate-to-vigorous physical activity (MVPA) during weekdays and weekends. Methods: This cross-sectional sample included 1014 children aged 6–10 years from the REACT project. Physical activity was assessed with accelerometry, and five FMS (stationary dribble, kick, catch, overhand throw, and underhand roll) were assessed with the digital platform Meu Educativo®. Three groups were formed based on the frequency of FMS that each child mastered: group 1 (wizard level in four or five FMS); group 2 (wizard level in two or three FMS); and group 3 (wizard level …

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Individual And School Correlates Of Body Mass Index And Cardiorespiratory Fitness In Primary School Children From The React Project: A Multivariate Multilevel Analysis, Sara Pereira, Peter T. Katzmarzyk, Fernando Garbeloto, Jean Philippe Chaput, Donald Hedeker, Tiago V. Barreira, Renata Borges, Rui Garganta, Carla Santos, Cláudio Farias, David F. Stodden, Go Tani, José Maia Jul 2024

Individual And School Correlates Of Body Mass Index And Cardiorespiratory Fitness In Primary School Children From The React Project: A Multivariate Multilevel Analysis, Sara Pereira, Peter T. Katzmarzyk, Fernando Garbeloto, Jean Philippe Chaput, Donald Hedeker, Tiago V. Barreira, Renata Borges, Rui Garganta, Carla Santos, Cláudio Farias, David F. Stodden, Go Tani, José Maia

Population and Public Health Science Faculty Publications

Objective: This paper examines the relationship between body mass index (BMI) and cardiorespiratory fitness (CRF) using a multivariate multilevel approach and investigates the links between individual and school-related correlates with children's BMI and CRF. Methods: This cross-sectional sample included 1014 children (6–10 years) from 25 Portuguese primary schools. BMI was calculated, and CRF was assessed with the PACER test. Fundamental movement skills (FMS) included five object control tasks. Moderate-to-vigorous physical activity (MVPA), sleep, and sedentary time were assessed with the ActiGraph wGT3X-BT accelerometer. Socioeconomic status (SES) and school variables were also obtained. A multivariate multilevel model was used, and alpha …

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Validity And Reliability Of Meu Educativo®: A New Tool To Assess Fundamental Movement Skills In School-Aged Children, Fernando Garbeloto, Sara Pereira, Go Tani, Jean Philippe Chaput, David F. Stodden, Rui Garganta, Donald Hedeker, Peter T. Katzmarzyk, José Maia Jul 2024

Validity And Reliability Of Meu Educativo®: A New Tool To Assess Fundamental Movement Skills In School-Aged Children, Fernando Garbeloto, Sara Pereira, Go Tani, Jean Philippe Chaput, David F. Stodden, Rui Garganta, Donald Hedeker, Peter T. Katzmarzyk, José Maia

Population and Public Health Science Faculty Publications

Objectives: There is evidence showing that children's proficiency in fundamental movement skills (FMS) is positively related to weight status, physical activity, fitness levels, cognitive development, as well as academic performance. Yet, the feasibility of FMS assessment is challenging, especially with relatively large samples of children. This article presents a new tool named Meu Educativo® to assess children's FMS levels, including its validity and reliability. Methods: We relied on the validity evidence approach based on test content to develop the FMS assessment checklist and the rating system with a team of experts. In this article, we used five FMS (stationary dribbling, …

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Absence Of Quantization In The Circular Photogalvanic Effect In Disordered Chiral Weyl Semimetals, Ang Kun Wu, Daniele Guerci, Yixing Fu, Justin H. Wilson, J. H. Pixley Jul 2024

Absence Of Quantization In The Circular Photogalvanic Effect In Disordered Chiral Weyl Semimetals, Ang Kun Wu, Daniele Guerci, Yixing Fu, Justin H. Wilson, J. H. Pixley

Faculty Publications

The circularly polarized photogalvanic effect (CPGE) is studied in chiral Weyl semimetals with short-range quenched disorder. Without disorder, the topological properties of chiral Weyl semimetals lead to quantization of the CPGE, which is a second-order optical response. Using a combination of diagrammatic perturbation theory in the continuum and exact numerical calculations via the kernel polynomial method on a lattice model, we show that disorder perturbatively destabilizes the quantization of the CPGE.

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Links Between Optical And X-Ray Light In Cygnus X-2, Alexander B. Igl, R. I. Hynes, K. S. O'Brien, E. L. Robinson, C. T. Britt Jul 2024

Links Between Optical And X-Ray Light In Cygnus X-2, Alexander B. Igl, R. I. Hynes, K. S. O'Brien, E. L. Robinson, C. T. Britt

Faculty Publications

We observed the low-mass X-ray binary Cyg X-2 for a total of 18 nights over two observing runs in July and September of 2006, using the Otto Struve Telescope at McDonald Observatory and the Rossi X-ray Timing Explorer. Using discrete cross-correlations, we found peaks occurring at near-zero lags in the flaring branch of the colour-colour diagram, which could signify reprocessing, in addition to an anticorrelation within the normal branch. When comparing optical flux to the system's placement on the Z track, two distinct behaviours were seen: (1) a state with no correlation, and (2) a multivalued (horizontal and normal branches)/correlated …

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Grb 180128a: A Second Magnetar Giant Flare Candidate From The Sculptor Galaxy, Aaron C. Trigg, Eric Burns, Oliver J. Roberts, Michela Negro, Dmitry S. Svinkin, Matthew G. Baring, Zorawar Wadiasingh, Nelson L. Christensen, Igor Andreoni, Michael S. Briggs, Niccolò Di Lalla, Dmitry D. Frederiks, Vladimir M. Lipunov, Nicola Omodei, Anna V. Ridnaia, Peter Veres, Alexandra L. Lysenko Jul 2024

Grb 180128a: A Second Magnetar Giant Flare Candidate From The Sculptor Galaxy, Aaron C. Trigg, Eric Burns, Oliver J. Roberts, Michela Negro, Dmitry S. Svinkin, Matthew G. Baring, Zorawar Wadiasingh, Nelson L. Christensen, Igor Andreoni, Michael S. Briggs, Niccolò Di Lalla, Dmitry D. Frederiks, Vladimir M. Lipunov, Nicola Omodei, Anna V. Ridnaia, Peter Veres, Alexandra L. Lysenko

Faculty Publications

Magnetars are slowly rotating neutron stars that possess the strongest magnetic fields known in the cosmos (1014-1015 G). They display a range of transient high-energy electromagnetic activity. The brightest and most energetic of these events are the gamma-ray bursts (GRBs) known as magnetar giant flares (MGFs), with isotropic energies Eiso10441046 erg. Only seven MGF detections have been made to date: three unambiguous events occurred in our Galaxy and the Magellanic Clouds, and the other four MGF candidates are associated with nearby star-forming galaxies. As all seven identified MGFs are bright at Earth, additional weaker …

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An Ixpe-Led X-Ray Spectropolarimetric Campaign On The Soft State Of Cygnus X-1: X-Ray Polarimetric Evidence For Strong Gravitational Lensing, James F. Steiner, Edward Nathan, Kun Hu, Henric Krawczynski, Michal Dovčiak, Alexandra Veledina, Fabio Muleri, Jiri Svoboda, Kevin Alabarta, Maxime Parra, Yash Bhargava, Giorgio Matt, Juri Poutanen, Pierre Olivier Petrucci, Allyn F. Tennant, M. Cristina Baglio, Luca Baldini, Samuel Barnier, Sudip Bhattacharyya, Stefano Bianchi, Maimouna Brigitte, Mauricio Cabezas, Floriane Cangemi, Fiamma Capitanio, Jacob Casey, Nicole Rodriguez Cavero, Simone Castellano, Elisabetta Cavazzuti, Sohee Chun, Eugene Churazov, Enrico Costa, Niccolò Di Lalla, Alessandro Di Marco Jul 2024

An Ixpe-Led X-Ray Spectropolarimetric Campaign On The Soft State Of Cygnus X-1: X-Ray Polarimetric Evidence For Strong Gravitational Lensing, James F. Steiner, Edward Nathan, Kun Hu, Henric Krawczynski, Michal Dovčiak, Alexandra Veledina, Fabio Muleri, Jiri Svoboda, Kevin Alabarta, Maxime Parra, Yash Bhargava, Giorgio Matt, Juri Poutanen, Pierre Olivier Petrucci, Allyn F. Tennant, M. Cristina Baglio, Luca Baldini, Samuel Barnier, Sudip Bhattacharyya, Stefano Bianchi, Maimouna Brigitte, Mauricio Cabezas, Floriane Cangemi, Fiamma Capitanio, Jacob Casey, Nicole Rodriguez Cavero, Simone Castellano, Elisabetta Cavazzuti, Sohee Chun, Eugene Churazov, Enrico Costa, Niccolò Di Lalla, Alessandro Di Marco

Faculty Publications

We present the first X-ray spectropolarimetric results for Cygnus X-1 in its soft state from a campaign of five IXPE observations conducted during 2023 May-June. Companion multiwavelength data during the campaign are likewise shown. The 2-8 keV X-rays exhibit a net polarization degree PD = 1.99% ± 0.13% (68% confidence). The polarization signal is found to increase with energy across the Imaging X-ray Polarimetry Explorer’s (IXPE) 2-8 keV bandpass. The polarized X-rays exhibit an energy-independent polarization angle of PA = −25.°7 ± 1.°8 east of north (68% confidence). This is consistent with being aligned to Cyg X-1’s au-scale compact radio …

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Out Of Time Order Correlation Of The Hubbard Model With Random Local Disorder, Chakradhar Rangi, Juana Moreno, Ka Ming Tam Jul 2024

Out Of Time Order Correlation Of The Hubbard Model With Random Local Disorder, Chakradhar Rangi, Juana Moreno, Ka Ming Tam

Faculty Publications

The out-of-time-order correlator (OTOC) serves as a powerful tool for investigating quantum information spreading and chaos in complex systems. We present a method employing non-equilibrium dynamical mean-field theory and coherent potential approximation combined with diagrammatic perturbation on the Schwinger-Keldysh contour to calculate the OTOC for correlated fermionic systems subjected to both random disorder and electron interaction. Our key finding is that random disorder enhances the OTOC decay in the Hubbard model for the metallic phase in the weakly interacting limit. However, the current limitation of our perturbative solver restricts the applicability to weak interaction regimes.

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In Vitro Culture Alters Cell Lineage Composition And Cellular Metabolism Of Bovine Blastocyst, Hao Ming, Mingxiang Zhang, Sandeep Rajput, Deirdre Logsdon, Linkai Zhu, William B. Schoolcraft, Rebecca L. Krisher, Zongliang Jiang, Ye Yuan Jul 2024

In Vitro Culture Alters Cell Lineage Composition And Cellular Metabolism Of Bovine Blastocyst, Hao Ming, Mingxiang Zhang, Sandeep Rajput, Deirdre Logsdon, Linkai Zhu, William B. Schoolcraft, Rebecca L. Krisher, Zongliang Jiang, Ye Yuan

Faculty Publications

Profiling bovine blastocyst transcriptome at the single-cell level has enabled us to reveal the first cell lineage segregation, during which the inner cell mass (ICM), trophectoderm (TE), and an undefined population of transitional cells were identified. By comparing the transcriptome of blastocysts derived in vivo (IVV), in vitro from a conventional culture medium (IVC), and in vitro from an optimized reduced nutrient culture medium (IVR), we found a delay of the cell fate commitment to ICM in the IVC and IVR embryos. Developmental potential differences between IVV, IVC, and IVR embryos were mainly contributed by ICM and transitional cells. Pathway …

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Secondary School State Athletic Association Health And Safety Policy Development Processes, Susan Yeargin, Rebecca M. Hirschhorn, William M. Adams, Samantha E. Scarneo-Miller Jul 2024

Secondary School State Athletic Association Health And Safety Policy Development Processes, Susan Yeargin, Rebecca M. Hirschhorn, William M. Adams, Samantha E. Scarneo-Miller

Faculty Publications

Background: The National Federation of State High School Associations provides recommendations regarding health and safety policies; however, policy development is governed at the state level. Given interstate differences in governance, the primary purpose was to describe processes that State High School Athletic Associations (SHSAAs) utilize to develop a new policy. The secondary objective was to determine what methods associations use to implement new policies. Methods: A cross-sectional survey requested SHSAA (n = 51) representatives to report how athlete health and safety policies are introduced, revised, approved, and implemented within their state. The 22-question survey was developed to gather variables for …

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Snapshots Of Coastal Ecology Using Multiproxy Analysis Reveals Insights Into The Preservation Of Swamp And Marsh Environments Since The Late Pleistocene, Kendall Fontenot, Kristine L. Delong, Brian A. Schubert, Sophie Warny, Davin J. Wallace, Carrie M. Miller, Erin Culver-Miller, Michael J. Polito, Carl A. Reese, Kathryn Garretson, Kehui Xu, Grant L. Harley, Jeffrey Obelcz, Kelli L. Moran, Julian Traphagan, Douglas Jones, Alicia Caporaso Jul 2024

Snapshots Of Coastal Ecology Using Multiproxy Analysis Reveals Insights Into The Preservation Of Swamp And Marsh Environments Since The Late Pleistocene, Kendall Fontenot, Kristine L. Delong, Brian A. Schubert, Sophie Warny, Davin J. Wallace, Carrie M. Miller, Erin Culver-Miller, Michael J. Polito, Carl A. Reese, Kathryn Garretson, Kehui Xu, Grant L. Harley, Jeffrey Obelcz, Kelli L. Moran, Julian Traphagan, Douglas Jones, Alicia Caporaso

Faculty Publications

The southeastern United States Coastal Plain ecosystem contains baldcypress (Taxodium distichum) swamps and grass-dominated marshes. These ecosystems also occurred on the exposed continental shelf during lower sea levels but are rarely preserved due to the mechanically erosive nature of transgression and regression. Two presently marine sites on the northeastern Gulf of Mexico's continental shelf contain well-preserved woody terrestrial sediments that were the subject of previous studies. This study continues the investigation using geochemical (δ13C, δ15N, δ34S) and palynological characteristics of these formerly terrestrial sediments to determine if swamps and/or marshes existed at the time of deposition. The first site is …

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A Review Of The Rheological Consistency Of Materials, Alan Gurt, Michael Khonsari Jul 2024

A Review Of The Rheological Consistency Of Materials, Alan Gurt, Michael Khonsari

Faculty Publications

Despite the ubiquity and prevalence of rheological consistency across a wide range of industries, there is no clear consensus on its meaning or on one particular technique for quantifying it. Instead, there exist various definitions of “consistency” that are each specific to a given context, and each industry has its own procedure for measuring it. This paper organizes the many subjects and terminologies associated with consistency, providing a comprehensive guide of fundamental mechanics, fundamental properties, modeling techniques, and standardized tests that describe consistency. This includes outlining the rheological models that describe the behavior of viscoelastic and non-Newtonian materials as well …

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Deep Learning-Based Geomorphic Feature Identification In Dredge Pit Marine Environment, Wenqiang Zhang, Xiaobing Chen, Xiangwei Zhou, Jianhua Chen, Jianguo Yuan, Taibiao Zhao, Kehui Xu Jul 2024

Deep Learning-Based Geomorphic Feature Identification In Dredge Pit Marine Environment, Wenqiang Zhang, Xiaobing Chen, Xiangwei Zhou, Jianhua Chen, Jianguo Yuan, Taibiao Zhao, Kehui Xu

Faculty Publications

Deep learning methods paired with sidescan sonar (SSS) are commonly used in underwater search-and-rescue operations for drowning victims, wrecks, and airplanes. However, these techniques are primarily used to detect mine-like objects and are rarely applied to identifying features in dynamic dredge pit environments. In this study, we present a Sandy Point dredge pit (SPDP) dataset, in which high-resolution SSS data were collected from the west flank of the Mississippi bird-foot delta on the Louisiana inner shelf. This dataset contains a total of 385 SSS images. We then introduce a new Effective Geomorphology Classification model (EGC). Through ablation studies, we analyze …

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Skilled Labor Shortage In Construction: Deep Dive Of Impactful Factors And Influential People Of The Decision-Making Process, Nicholas B. Hardy Jul 2024

Skilled Labor Shortage In Construction: Deep Dive Of Impactful Factors And Influential People Of The Decision-Making Process, Nicholas B. Hardy

LSU Doctoral Dissertations

The skilled labor shortage is well documented from a historical perspective via studies focusing on various construction trades such as carpentry, mechanical, electrical, plumbing, and tile setters. Causes of such shortages such as industry image, college as a preferred choice after high school, and construction being a last resort have been investigated extensively. Consequently, possible solutions ranging from amplifying shop classes in high school to intensifying recruiting efforts for union training programs have all been addressed throughout the last 40 years. However, recent studies have focused on identifying the magnitude and reach of the skilled labor gap while limited attention …

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